Pulverized Coal Preparation Production Line Choose Vertical Mill or Ball Mill?

Pulverized coal preparation production line is composed of Raw Coal Storage & Transportation System, Grinding System, Dust Collecting System, Electrical & Instrument Automation System. By the consideration of safety protection for equipment and system, explosion venting valve and nitrogen protection port are adopted at hot air inlet pipeline of Air Swept Coal Mill and coal air output pipeline. Speed of Powder Separator is regulated by VVF, the output fineness could be controlled by adjustment of frequency converter by remote control.
At present, pulverized coal preparation production line choose vertical mill or ball mill?
For the current slightly pre-decomposition kiln production line, or have to use the ball mill. With the successful usage of anthracite in the pre-decomposition production line, this choice is increasing, the process is simple; but also because the domestic suppliers of vertical grinding technology has matured. However, the scale for the kiln is too small. But for the corrosive strong coal, or are the old factory to adjust the preparation of coal are generally used vertical grinding. This is not only because of the vertical grinding process has a significant reduction in power consumption, cost savings, the usage of grate cooler exhaust gas high efficiency, equipment low cover area small, reduce plant construction, and make full use of the original equipment.

Pulverized Coal Preparation Production Technology
★ Raw coal storage and transportation system
1、The raw coal with size under 35mm and moisture under 15% is conveyed to raw coal shed by auto dumper.
2. The rod valve is set between coal receiving hopper and vibrating feeder. It would be closed for maintenance operation of speed adjustable feeding belt conveyor.
★ Pulverized Coal Preparation System
1. The raw coal from storage and conveying system come into air swept coal mill for grinding. The coal powder mass and heat transfer with 200℃~350℃ hot air.
2. To protect the equipment and system safety, the explosion venting valve and nitrogen protection connector are set on hot wind inlet pipe of air swept coal mill and outlet pipe of coal wind.
★ Pulverized Coal Collecting System
Under the negative pressure of induced draught fan set after explosion proof bag filter, the qualified coal powder discharged from powder separator, and come to explosion proof bag filter by coal wind pipe.